Chandler Carruth e74a4a7915 Remove some buggy and apparantly unnecessary code from SROA. ... The partitioning logic attempted to handle uses of an alloca with an offset starting before the alloca so long as the use had some overlap with the alloca itself. However, there was a bug where we tested '(uint64_t)Offset >= AllocSize' without first checking whether 'Offset' was positive. As a consequence, essentially every negative offset (that is, starting *before* the alloca does) would be thrown out, even if it was overlapping. The subsequent code to throw out negative offsets which were actually non-overlapping was essentially dead. The code to *handle* overlapping negative offsets was actually dead! I've just removed all of this, and taught SROA to discard any uses which start prior to the alloca from the beginning. It has the lovely property of simplifying the code. =] All the tests still pass, and in fact no new tests are needed as this is already covered by our testsuite. Fixing the code so that negative offsets work the way the comments indicate they were supposed to work causes regressions. That's how I found this. Anyways, this is all progress in the correct direction -- tightening up SROA to be maximally aggressive. Some day, I really hope to turn out-of-bounds accesses to an alloca into 'unreachable'. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169120 91177308-0d34-0410-b5e6-96231b3b80d8		2012-12-03 10:59:55 +00:00
..
Analysis	Move the InstVisitor utility into VMCore where it belongs. It heavily	2012-11-30 03:08:41 +00:00
Archive	Mark checkSignature const, and in turn stop casting away const from	2012-09-05 22:09:23 +00:00
AsmParser	Add back support for reading and parsing 'deplibs'.	2012-11-28 08:41:48 +00:00
Bitcode	Add back support for reading and parsing 'deplibs'.	2012-11-28 08:41:48 +00:00
CodeGen	Allow merging multiple store sequences on the same chain.	2012-12-02 17:14:09 +00:00
DebugInfo	The section is .debug_line.	2012-11-27 01:40:36 +00:00
ExecutionEngine	Move the InstVisitor utility into VMCore where it belongs. It heavily	2012-11-30 03:08:41 +00:00
Linker	Remove the dependent libraries feature.	2012-11-27 09:55:56 +00:00
MC	MC/AsmParser: Avoid unnecessary use of SourceMgr::FindBufferForLoc()	2012-12-01 01:38:48 +00:00
Object	Object: Pass the buffer name through when making a copy.	2012-11-29 20:08:03 +00:00
Support	Add support for fission attributes/forms/operations -> string.	2012-11-30 23:20:43 +00:00
TableGen	Remove exception handling usage from tblgen.	2012-10-25 20:33:17 +00:00
Target	Define signed const-ext predicates.	2012-12-03 06:54:50 +00:00
Transforms	Remove some buggy and apparantly unnecessary code from SROA.	2012-12-03 10:59:55 +00:00
VMCore	Revert previous check in r168581, r169079 as they are still in code review status.	2012-12-01 10:54:28 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile